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Sailboat Specifications

King 40

Fractional Sloop · Fin W/Bulb & Spade Rudder

Designed by Mills Design · Built by Summit Yachts (Usa) · First built 2001

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LOA 39.73 ft  ·  Beam 12.14 ft  ·  Displacement 15,653.00 lb  ·  Sail Area 863.00 ft²  ·  Fractional Sloop  ·  Fin W/Bulb & Spade Rudder
About the King 40 Sailboat

Mills Design created this impressive 40-footer for Summit Yachts as a performance-oriented cruiser that bridges the gap between racing and comfortable passage-making. Built from 2001 onward, the King 40 showcases a modern fin keel with bulb and spade rudder configuration that delivers excellent upwind performance while maintaining good directional stability. The fractional sloop rig generates substantial sail area relative to displacement, giving this boat spirited performance in light to moderate conditions. With a respectable sail area-to-displacement ratio of 22.15 and hull speed of 7.90 knots, the King 40 rewards skilled sailors with impressive boat speeds. The relatively low comfort ratio of 24 indicates this design prioritizes performance over interior volume, making it ideal for sailors who value sailing ability over maximum living space. The boat's moderate displacement of 15,653 pounds combined with nearly 50% ballast ratio provides excellent stability and sea-keeping abilities. This makes the King 40 well-suited for coastal cruising and weekend racing, though its robust construction and seaworthy design characteristics also make it capable of offshore passages. The capsize screening formula of 1.94 falls within acceptable ranges for ocean sailing, reflecting the designer's attention to creating a truly versatile sailing platform.

Dimensions & Specifications
LOA (Length Overall) 39.73 ft / 12.11 m
LWL (Waterline Length) 34.78 ft / 10.60 m
Beam 12.14 ft / 3.70 m
Max Draft 8.23 ft / 2.51 m
Displacement 15,653.00 lb / 7,100 kg
Ballast 7,275.00 lb / 3,300 kg
Ballast Type Lead
Sail Area (Reported) 863.00 ft² / 80.18 m²
Design & Construction
Hull Type Fin w/bulb & spade rudder
Rigging Type Fractional Sloop
Construction FG
Designer Mills Design
Builder Summit Yachts (USA)
First Built 2001
Related Sailboats J/39 · X 402 · Hanse 400 2008 2014 · X4 · Contest 40S
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Engine & Accommodations
Engine Make Yanmar w/saildrive
Engine Model 3JH4E
Engine Type Diesel
Horsepower 39
Fuel Capacity 26 gals / 98 L
Water Capacity 53 gals / 201 L
Frequently Asked Questions

What is the King 40's sail area to displacement ratio?

The King 40 has a Sail Area to Displacement ratio (SA/D) of 22.15. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the King 40's comfort ratio?

The King 40 has a Ted Brewer Comfort Ratio of 24. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the King 40 safe for offshore sailing?

The King 40 has a Capsize Screening Formula value of 1.94. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the King 40?

The theoretical hull speed of the King 40 is 7.90 kn knots, calculated from its waterline length.

How much does a King 40 weigh?

The King 40 has a displacement of 15,653.00 lb and a length overall (LOA) of 39.73 ft.

Who designed the King 40?

The King 40 was designed by Mills Design, first built in 2001.